Acceleration of falling mass and tension in the cord

A 25 kg wheel has a radius of 40cm and turns freely on a horizontal axis. The radius of gyration is 30cm. A 1.2 kg mass hangs at the end of a cord that is wound around the rim of the wheel. This mass falls and causes the wheel to rotate. Find the acceleration of the falling mass and the tension in the cord

2. Relevant equations

I= Mk^2
a= [itex]\alpha[/itex] r

3. The attempt at a solution

I figured out the inertia, with that being I=25*.3^2 to get 2.26.

The downward force on the object would be mg-Ft
The upward force is just Ft, I believe.

But somewhere in there has to go acceleration, which is a=[itex]\alpha[/itex]*.4

I think I need another equation to set everything to, but I don't know what to do...